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114 Cards in this Set
- Front
- Back
- 3rd side (hint)
As a diamonds Pavilion gets deeper it's table reflection becomes |
Larger |
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If a diamonds culet is too large it will look like |
A black spot under the table |
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Which of the following Pavilion depth percentages would most likely cause a girdle reflection to be visible face up through the table |
37.0 % |
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The care that goes into the fashioning of a polished Diamond as confirmed by its finish is its |
Craftsmanship |
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Lower half facet length is expressed as a percentage of the |
Girdle-to-culet distance |
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The purpose of the culet facet is to |
Prevent chipping |
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The proportions that play the biggest role in determining a round brilliant diamonds brightness are table percentage, Crown angle, and |
Pavilion angle |
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Culet size should be considered when determining |
Pavillion depth percentage |
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Which of the following is part of the evaluation of symmetry |
Natural |
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A diamond with variations in alignment probably also has |
Misshapen facets |
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A diamond with a thick girdle, steep Crown or deep pavilion represents poor value because |
It appears smaller face up than its weight suggest |
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A diamonds physical shape including its proportions and durability determined by decisions made during the fashioning process is its |
Design |
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Most diamonds have some symmetry variation |
But they rarely effect appearance |
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The more inclusion differs in color from its host diamond |
The more obvious it is |
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A feather that reaches the bezel surface as well as the surface in the pavillion main directly under the bezel |
Should be plotted on both the crown and Pavilion diagrams |
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Blemish dont usually affect the clarity grade in diamonds below |
IF |
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The stone with this Clarity characteristics which would be the grade setting characteristic |
Feather |
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Which of these would disqualify a Stone from being graded IF |
Pinpoint |
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On a plot drawing a characteristic only in green indicates that it's |
A blemish |
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Diamonds with minute inclusions that range from extremely difficult to very difficult to see under 10x are classified |
VVS1 OR VVS2 |
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Inclusions or blemishes that established the clarity grade of a diamond are collectively called |
Grade setting characteristics |
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In most cases the easier it is to see a Clarity characteristics , the... |
Lower the clarity grade |
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Does designation S I means |
Slightly included |
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A round brilliant cut VVS Diamond could have |
A small pinpoint under a lower half facet |
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VS1 and vs2 Stones might have |
Minor included crystals and feathers |
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One factor used to determine the clarity grade of a diamond is a inclusions |
Location |
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A Stone with only a few extra facets on its Pavilion that can't be seen face up should be graded |
Flawless |
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Inclusions are usually most visible when they're located |
Directly under the table |
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Colorless diamonds are more valuable than others in the normal color range because they |
Are more rare |
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Trade terms that describe Diamond color |
Can be misleading |
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Diamonds used as stones for color grading in the normal color range are called |
Master stones |
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The most widely accepted lighting for color grading diamonds is |
Balanced, daylight-equivalent fluorescent light |
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Subtle color differences are usually more visible when seen |
Through the pavillion |
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A master Stone graded as a whole grade represents the |
Least amount of color possible in that grades range |
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The color grade of a diamond that appears darker than the H masterstone but lighter than the I would be |
H |
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Which of the following makes a diamond unsuitable for master Stone set |
Fluorescence |
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When color grading with Master stones you should |
Move the unknown to compare it on both sides of the master stones |
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A loose Brown Diamond should be color graded |
As a range of colors |
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If a diamond has a slight tint in the face down position and appears colorless in the face up position its estimated color should be |
G,H, I, J |
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The basic face up color of a colored diamond is known as its |
Characteristic color |
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Diamonds outside normal color range are graded |
Face up |
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The GI laboratory uses a Z master Stone to determine fancy |
Yellows |
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A diamond grading system provides |
A consistent way to communicate Diamond quality |
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A wholesaler is someone who |
Sell to retailers |
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Diamond prices on wholesale price list |
Graded much more thoroughly than small low-quality ones |
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Diamonds Supreme hardness and durability are |
A result of the conditions under which its formed |
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Once Diamond deposits are located mining companies |
Must spend additional time and money to evaluate and develop them |
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An estimation of the value of the article is a |
Appraisal |
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The most consistent and dependable sources of diamond grades are |
Reputable gemological laboratories |
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Substantial price discounts are available to retailers and jewelry manufacturers who |
Can buy in large quantities |
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Diamond clarity and color grades indicates it's |
Quality |
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Reputable gemological laboratories don't grade mounted diamonds |
Because mountings hide details of clarity and cut |
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Dealers often sort melee by size using |
Sieves |
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The diamond industry has changed dramatically in recent years because |
The world's supply of diamond rough has increased |
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The argyle mine in Australia contributed to |
The rise of the cutting industry in india |
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Wholesale price lists are usually organized according to |
Specific combinations of the four cs |
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Trigons are |
Growth marks |
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Inclusions are easier to see using |
Dark field illumination |
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Included diamond crystal that expense the surface of a fashioned diamond is called a |
Knot |
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A paper worn diamond is one that |
Abrasions |
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A indention with tiny root like feathers penetrating the stone is called a |
Bruise |
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Which of the following is classified as a inclusion |
Chip |
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Example of a blemish is a |
Natural |
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A solid mineral body enlosed within a diamond or other gem is |
An included crystal |
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The inclusion called bearding consists of tiny |
Feathers |
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A portion of the roughs original surface or skin that dips below the Polish diamonds surface is called a |
Indented natural |
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A term used to describe any break within a diamond is |
Feather |
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A Clarity characteristics of onto the surface of a polished gemstone is called a |
Blemish |
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A loupe usedfor clarity grading must be corrected for a chromatic and |
Spherical distortion |
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With dark field illumination light is directed into the Stone from |
The side |
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Which of the following is not a diamond inclusion |
Gas bubble |
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Squares or rectangles, trigons and parallel grooves are types of |
Growth marks |
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The crystal planes most suitable for cleaving a Diamond are the |
Octahedral planes |
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Which is the softest Crystal Direction in Diamond |
Dodecahedral |
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Crystal shape is an important factor in the evaluation of rough because |
It affects the amount of weight retained after cutting |
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The diamond term glassie refers to |
A well formed octahedral crystal |
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A naturally occurring inorganic substance with a characteristic chemical composition and usually a characteristic crystal structure is known as a |
Mineral |
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The habit of gem quality diamond is the |
Octahedron |
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Another name for the cubic Crystal system is |
Isometric |
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And diamonds cleavage is caused by |
Relatively wide spaces between some Atomic planes |
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A flat triangular twinned diamond crystal is called a |
Macle |
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The strongest of all Atomic bonds are called |
Covalent |
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Solid matter with atoms arranged in a regular repeating pattern is called a |
Crystal |
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The smallest group of atoms with a characteristic chemical composition and the basic crystal structure of a mineral is called a |
Unit cell |
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What is the specific gravity of gem-quality diamond |
3.52 |
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Atoms in a gem that aren't part of his essential chemical composition are called |
Trace elements |
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A round brilliant diamonds table size is expressed as |
A percentage of its average girdle diameter |
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If a diamonds total but that percentage is 51.0% its cut grade will be |
Fair or poor |
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A transparent measuring device divided into millimeters and tenths of a millimeter used to measure a diamonds table is called a |
Table gauge |
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Advantage of the face of method of crown angle estimation is that it |
Can be used with mounted diamonds |
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What is the crown high percentage of a diamond with a crown angle of 32 degrees and 60% table |
12.5% |
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Extremely thick girdle |
Adds weight without contributing to the stone appearance |
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Most round brilliants have tables percentages that range from about |
55 to 65 percent |
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The counting of the angle formed by the girdle plan and the |
Bezel facets |
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On a well-made diamond the girdle will |
Have just enough thickness to prevent chipping |
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A weight retention method that adjusts the angles of some facets to allow proportions of a diamond girdle to be thicker is called |
Painting |
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When using the Bowing method fastest that reach one third of the way toward the girdle make the lines appear |
To bow out |
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When using the ratio method for estimating table percentage a 1 1/4 ratio indicates a table of approximately |
60 percent |
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The relative size, arrangement and contrast of bright and dark areas that result from a diamonds internal and external Reflections is called |
Pattern |
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The flashes of color you see in a polished Diamond are called |
Fire |
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Variations in lighting and surroundings can affect a diamonds |
Appearance |
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Visible light is |
A form of radiant energy |
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Diamonds RI is |
2.417 |
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White light is actually |
A combination of all the spectral colors |
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The passage of light into a through a material is called |
Transmission |
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The higher the optical density of a material, the |
More it slows down |
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The change in speed and possible change in direction of light as it travels from one material to another is called |
Refraction |
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In order to exit a diamond light must strike an inner surface |
Inside the critical angle |
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The flashes of light and the contrasting dark areas you see when the diamond, the light or the Observer moves are called |
Scintillation |
Pattern and sparkle |
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The appearance of material surface in reflected light is called |
Luster |
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Grease on the Pavilion of a diamond results in |
More light leakage through the pavillion |
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The difference between the ri values of specific violet and red wavelengths of visible light for a given material is its |
Dispersion |
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The angle of incidence always equals the |
Angle of reflection |
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The combined effect of all the diamonds surface and internal whitelight reflection is it |
Brightness |
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